PurposeManagers and management studies have for long assumed the separation of humans and nature that led to criticisms due to overexploitation of resources. This prompted organizations to adopt effective environmental management strategies. In this context, the specialized literature states that green human resource management (GHRM) and green transformational leadership (GTFL) coupled with Green Culture (GC) is considered a central aspect in improving the organization's environmental performance (EP). Based on this argument, this study has shown how GHRM strategies as studied under the heading – green ability, motivation and opportunity (GAMO) and GTFL can help in improving the EP of organizations. Studies have highlighted culture as an important mediator, we have therefore explored the mediating effect of green culture between GAMO and EP and between GTFL and EP.Design/methodology/approachUsing ability, motivation, opportunity theory and resource-based view, we have developed a model with GAMO and GTFL as independent variables, GC as a mediator and EP as the dependent variable. Data was collected from 150 top and middle-level managers working in Indian oil and gas companies, which is 50% of the target sample size and has been analysed using structural equation modelling.FindingsThe research identifies that GAMO and GTFL, in fact, positively influence the EP of organizations. Moreover, GC was found to have a partial mediating effect between both GAMO and EP and GTFL and EP.Research limitations/implicationsDue to several constraints, this study is designed to be cross-sectional. Longitudinal study is encouraged in this area. Further, the study is based on oil and gas industry operating in India, going forward the study can be extended to other sectors, to increase the generalizability of the findings.Practical implicationsThis study clearly shows that by investing in GHRM strategies, organizations will ultimately improve in green activities to improve see improvement in the firm's EP. The findings of this study that clarifies the importance of GTFL in building suitable culture give evidence to the leaders on why they should play a proactive role in leading employees towards environmental sustainability.Originality/valueThe originality of this study lies in studying the simultaneous effect of GTFL and GAMO for improving the EP. Also, studies on green management literature have mostly missed out on the important role of GC in improving EP which is addressed in this study. The data has been collected from oil and gas industry operating in India, which to the best of our knowledge is the first attempt. Overall this study has contributed to the literature on environmental sustainability by underpinning the empirical relationship between GC, GAMO, GTFL and EP which until now has been mostly limited to the conceptual level.